Illuminating means.



1,1. FLANNERY u. I. 00003 lLLUMINAIlNG MEANS. APPLICATIONJILED JULY25. 19H.

Patented Aug. 13, 1918.

[N VEN T 0R5 Attvrmg's W T NESSES STATES PATENT orrron.

JAMES J. my AND n'rnmw I. nonns, or riwrsnunen, PENNSYLVANIA, assumons 'ro rnmnnav non comrm, orgm'r'rsnunen, rsmzsvnvam'a.

/ ILLUMINATING MEANS.

' To all whom it may concern Be it known that we, JAMES J. FLANNERY and ETHAN I. Donns, citizens of the United States, and residents of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Illuminating-Means;

and we do hereby declare the following to beja full,clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. i

This invention relates to improvements in illuminatin means and more particularly to lamps 0 the incandescent electric lamp type,the object of the invention being to so construct a lamp of the type specified that the same ma be made luminouswith suflicient, brilliancy for ordinary purposes where a mild-light is desired, by light stored or absorbed by material within the globe, which material shall be such as to be activated or energized by light from the in the bulb of the lamp.

lamp filament, and whereby a separate portion of the material shall be so contained within the lamp as to be physically separated from the other portion of said material andof such material as will be permanently luminous and serve to mildly activate the other portions of the material with- With this and other objects in view, the

invention consists in certain novel features of construction as hereinafter set forth and pointed out in the claims. 7

The accompanying drawing is a view showing an incandescent electric lamp of the Mazda type, showing the application of our improvements.

1 represents a glass bulb such as commonly employed in the construction of inc'andescent lamps, and containing a lighting element or filaments 3 supported by a glass bracket 4:. A portion of this bracket comprises a glass rod 5 around which the members of the filaments are supported.

In constructin our improved lamp, we provide the interior surface of the bulb with a coating 6 of phosphorescent material which will absorb light,-viz., which will be rendered luminous by li ht'rays,so that said coating will be energized by light ema- Specification of Letters Patent. P t nt 13, 191 Application filed July 25, 1917. Serial No. 182,781.

of radioactive material such as a salt of radium) as to render said coating (7) permanently luminous.

By lighting the filament of the lamp for a very brief period, the coating 6 will be activated or energized and cause it to absorb and emit sufficient luminosity to illuminate the surrounding area, where a mild illumi nation is desired. The luminous activity of the coating 7 on the bracket rod 5 will also be enhanced by'the periodical lighting of the lamp filament, but the said coating 7 will, by reason of its radium content, be permanently luminous and it will therefore serve to mildly actuate or illuminate the light absorbing coating 6.

Our improved lamp is useful in any place where a mild light is desirable and where economy in the use of electricity for lighting purposes is important,sucl i for example in ships cabins, especially in submarines. It may also be used to advantage on automoe'ater proportion biles and other vehicles, such as in railway and surrounding the same, a coating of specification in the presence of two subscribphosphorescent material on the lnner face mg wltnesses.

of said. bulb, and permanently luminous ma- JAMES J. FLANNERY. (ex-in] supported by the filament bracket so ETHAN I. DODDS.

5 as to be surrounded by the filament mem- Witnesses bers. G. H. GERDING,

In testimony whereof, we have signed this C. F. FRITZ. 

